Abstract
Observations primarily of the microwave background radiation show that the Universe expands isotropically with a high degree of accuracy at the present time and that the matter distribution is homogeneous on a large scale. Thus, the Friedmann cosmological models are a good approximation today for the expanding Universe. This is valid for at least some period of time in the past too. But how did the Universe expand and what was the matter distribution close to the starting point, near the cosmological singularity?
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Novikov, I.D. (1974). Isotropization of Homogeneous Cosmological Models. In: Longair, M.S. (eds) Confrontation of Cosmological Theories with Observational Data. International Astronomical Union / Union Astronomique Internationale, vol 63. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2220-0_22
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DOI: https://doi.org/10.1007/978-94-010-2220-0_22
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